If a traveler joins a resident behind the imam before the closing salam, does he complete the prayer or shorten it?

Question:
If one enters the prayer when the prayer is half over or has just been completed, the two intentions are combined.

Answer:
Yes, if one prays behind an imam who completes the prayer, it is obligatory for him to complete it, even if he did not enter until the very end, yes, or in the smallest part of it, because he is required to follow the imam; his ruling is the imam's ruling. Since the imam completes the prayer, he is required to complete it. Yes, yes. As for the resident who prays behind one who shortens the prayer, yes, when the imam who shortens the prayer says the closing salam, the resident stands up and completes his prayer. Naturally, the imam is not in this position in this case, because the Prophet (peace and blessings be upon him) said during the Battle of the Conquest, when he prayed with the people of Makkah: travelers, Allahu Akbar. So this is also an answer for those who ask about the ruling on completing the prayer behind a traveling imam.